Results 151 to 160 of about 1,253 (193)
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Underwater sound absorption characteristics of metamaterials with steel plate backing
Applied Acoustics, 2019Abstract Generally, the better sound absorption characteristics can be achieved in the low frequency band by embedding resonance units into the conventional anechoic coating. However, in this way, the frequency range of effective sound absorption is relatively narrow, which limits the application of anechoic coating in engineering.
Kangkang Shi +5 more
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Measurements of Underwater Sound Absorption Coefficient by the Reverberation Method
Japanese Journal of Applied Physics, 1986Measurements of underwater sound absorption coefficient are carried out on ten sample materials by the reverberation method using a reverberation water tank. In order to record short reverberation time in the tank, a digital memory is used. Measured absorption coefficient values are plotted against transmission loss of the samples, and the method is
Sumio Takahashi +2 more
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Effects of locally resonant modes on underwater sound absorption in viscoelastic materials
The Journal of the Acoustical Society of America, 2011Recently, by introducing locally resonant scatterers with spherical shape proposed in phononic crystals into design of underwater sound absorption materials, the low-frequency underwater sound absorption phenomenon induced by the localized resonances is observed. To reveal this absorption mechanism, the effect of the locally resonant mode on underwater
Jihong, Wen +5 more
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Tunable underwater sound absorption characteristics of 0–3 piezoelectric anechoic coating
The Journal of the Acoustical Society of AmericaPiezoelectric composite materials (PCMs) with shunt damping circuits are used widely in hydroacoustics because of the flexible adjustability of their parameters. PCMs offer good underwater sound absorption, but shortcomings remain, such as poor low-frequency sound absorption, narrow bandwidth, and a single dissipation mechanism.
Xinyu Jia +4 more
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Absorption of Underwater Sound by Substances in Process of Solution
Nature, 1955IN the course of work on the transmission of acoustic waves through aqueous solutions, we have noticed that solid substances in process of solution become extremely efficient absorbers of acoustic energy. In a typical experiment in which transmission was taking place at 400 kc./s. between transducers 1 ft. apart, the addition of 1 per cent by weight of
R. D. C. REED, T. S. McLEOD
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Influence of hole shape on sound absorption of underwater anechoic layers
Journal of Sound and Vibration, 2018Abstract A theoretical model is established to evaluate the sound absorption performance of underwater anechoic layers containing periodically distributed axial holes. Based on the concept for homogenized equivalent layer and on the theory of wave propagation in viscoelastic cylindrical tubes, the transfer function method is used to obtain the ...
Changzheng Ye +3 more
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Experimental Investigation of Composite Metamaterial for Underwater Sound Absorption
Applied Acoustics, 2023Nansha Gao +4 more
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Low-Frequency Underwater Sound Absorption of Hybrid Metamaterials Using Dissipative Slow-Sound
SSRN Electronic Journal, 2022Xindong Zhou, Mingyu Duan, Fengxian Xin
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Journal of Sound and Vibration, 2012
Abstract The study of acoustic metamaterials, also known as locally resonant sonic materials, has recently focused on the topic of underwater sound absorption. The high absorption occurs only within a narrow frequency band around the locally resonant frequency.
Hao Meng +3 more
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Abstract The study of acoustic metamaterials, also known as locally resonant sonic materials, has recently focused on the topic of underwater sound absorption. The high absorption occurs only within a narrow frequency band around the locally resonant frequency.
Hao Meng +3 more
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Method for constructing a lightweight resistive screen for underwater sound absorption
Deep Sea Research Part B. Oceanographic Literature Review, 1983A method for preparing a resistive screen for underwater sound absorption consisting of a metallic honeycomb structure, adding a thermosetting plastic material to the cells within said structure, heating said structure under pressure and forming small apertures within said thermosetting plastic material.
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